Allergies

Read more about...

An allergy is a hypersensitive reaction to a normally harmless substance. There are a variety of substances, termed allergens that may trouble a sensitive individual. Common allergens include pollen, animal dander, house dust, feathers, mites, chemicals, and a variety of foods. Some allergies primarily cause respiratory symptoms; others can cause such diverse symptoms as headache, fatigue, fever, diarrhea, stomachache, and vomiting. This entry addresses respiratory allergies, both chronic and seasonal.

If you have allergies you may suffer from a stuffy and or runny nose, sneezing, itchy skin and eyes, and/or red watery eyes. Needless to say, it can be very uncomfortable. These symptoms occur because, in the presence of an allergen, the immune system releases chemicals called histamines to fight what it perceives as an invader. Histamines cause a string of reactions, including the swelling and congestion of nasal passages and increased mucus production. This is essentially a hypersensitive, or overactive, response by the body to an external stimulus.

Whether allergies are seasonal or chronic depends on the particular allergens or allergens involved. Seasonal allergies tend to caused by pollen. Ongoing or chronic allergies are usually caused by factors that are present in the environment year-round, such as animal dander, dust or feathers. Chronic allergic rhinitis is a persistent inflammation of the mucous membrane lining the nasal passages that is caused by an allergic reaction. It is characterized by a stuffy, runny nose, frequent sneezing, and a tendency to breathe through the mouth. The eyes may be red and watery. Headache, itchiness, nosebleeds, and fatigue may be secondary complications. Dark circles under eyes along with a puffy look to the face are frequently seen. Whether symptoms occur seasonally or chronically, there is often a family history of allergies; many times a parent or grandparent of an allergy sufferer also had allergies.

Allergies can contribute to other chronic health problems, such as acne, asthma, eczema, incontinence, irritability, and even difficulty maintaining concentration. Allergic reactions can occur immediately after exposure to the offending substance, or take days to surface. A delay in the onset of an allergic reaction can make it more difficult to pinpoint the allergens.

General Recommendations for allergies

Preventive measures for allergies

There is no known way to prevent allergies from developing. However, if you suffer from allergies, you can prevent acute flare-ups of allergic symptoms by identifying those things you are allergic to and then avoiding them.

chemotherapy | genital warts
Medical Info